I hate the ERA idea. I am a guy that posts daily and I have an ERA over 9! Also I am about the only one active in the Twins forums and still I have a era that high. To me it seems like if your a friend your ERA is low.
Finally I think if the posts you make are not TOP quality your ERA rises and you sit in whatever level your at. I had an ERA under a 6 and it ballooned over 11! I don't understand that!